Arcs aren't drawn correctly on Windows 10, if sweep is negative

[lxn]

Positive sweeps:

But when changing drawtests.c as below...

@@ -161,7 +161,7 @@ static void drawArcs(uiAreaDrawParams *p)
 
 	path = uiDrawNewPath(uiDrawFillModeWinding);
 
-	add = (2.0 * uiPi) / 12;
+	add = -(2.0 * uiPi) / 12;
 
 	x = start + rad;
 	y = start + rad;

...we get negative sweeps resulting in this:

Same change on Linux:

[andlabs]

Hm. I forget if I even have negative arc sweep as supported; I should see what it looks like on macOS as well...

[mischnic]

Positive sweep:

Patch applied: